0 5 10 15 20 25 30 0 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 0 Probability Random Variable σ=0.5 σ=1 σ=2 σ=4 σ=10 Rayleigh Distribution CDF